tui_colors.py

Makefile

@@ -0,0 +1,14 @@
+include config.mk
+
+all:
+    
+                    
+install:
+	mkdir -p ${PREFIX}/bin
+	cp tui_colors.py ${PREFIX}/bin
+	chmod 755 ${PREFIX}/bin/tui_colors.py
+
+uninstall:
+	rm -f ${PREFIX}/bin/tui_colors.py
+
+.PHONY: install uninstall

config.mk

@@ -0,0 +1 @@
+PREFIX=/usr/local

tui_colors.py

@@ -0,0 +1,112 @@
+#!/usr/bin/env python3
+
+import os
+
+def determine_group(col):
+    if col == 0 or col == 7 or col == 8 or col == 15 or col >= 232:
+        return 0
+    if col < 8:
+        return col
+    if col < 16:
+        return col - 8
+    cp = col - 16
+    r = cp // 36
+    g = ((cp % 36) // 6)
+    b = cp % 6
+    if r == g and g == b:
+        return 0
+    r /= 5
+    g /= 5
+    b /= 5
+    max_val = max(r, g, b)
+    min_val = min(r, g, b)
+    delta = max_val - min_val
+    if max_val == r:
+        hue = (g - b) / delta
+        hue = hue + 6 if hue < 0 else hue
+    elif max_val == g:
+        hue = (b - r) / delta + 2
+    else:
+        hue = (r - g) / delta + 4
+    if hue < 0.5:
+        return 1
+    if hue < 1.5:
+        return 3
+    if hue < 2.5:
+        return 2
+    if hue < 3.5:
+        return 6
+    if hue < 4.5:
+        return 4
+    if hue < 5.5:
+        return 5
+    return 1
+
+
+def get_contrasting_color_rgb(r, g, b):
+    luminance = (0.299 * r + 0.587 * g + 0.114 * b)
+    return 15 if luminance < 0.7 else 0
+
+
+def get_contrasting_color(col):
+    if col == 7:
+        return 0
+    if col == 8:
+        return 15
+    if col < 8:
+        return 15
+    if col < 16:
+        return 0
+    if col > 249:
+        return 0
+    if col >= 232:
+        return 15
+    cp = col - 16
+    r = cp // 36
+    g = ((cp % 36) // 6)
+    b = cp % 6
+    return get_contrasting_color_rgb(r / 5, g / 5, b / 5)
+
+
+def print_color(col, fg_col):
+    print(f"\x1b[48;5;{col}m\x1b[38;5;{fg_col}m {col:3} \x1b[0m ", end="")
+
+def print_color_block(col):
+    print_color(col, get_contrasting_color(col))
+
+def print_empty_block():
+    print(end="      ")
+
+if __name__ == "__main__":
+    groups = [[] for i in range(7)]
+    for col in range(256):
+        groups[determine_group(col)].append(col)
+
+    width = os.get_terminal_size().columns
+    height = os.get_terminal_size().lines
+    k = (width - 13) // 42
+    if k < 1:
+        for i in range(7):
+            w = 0
+            for col in groups[i]:
+                if w + 6 >= width:
+                    print()
+                    w = 0
+                print_color_block(col)
+                w += 6
+            print("\n")
+    else:
+        n = max(map(lambda i: len(groups[i]) // k + (1 if len(groups[i]) % k else 0), range(7)))
+        vk = max(1, height // n - 1)
+        for L in range(n):
+            if L:
+                print(end="\n" * vk)
+            for i in range(7):
+                if i:
+                    print(end="  ")
+                for j in range(k):
+                    gi = L * k + j
+                    if gi < len(groups[i]):
+                        print_color_block(groups[i][gi])
+                    else:
+                        print_empty_block()